Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (14.39 USD): AFfbG10
Coupon (14.39 USD): BGBFAFF2019
Coupon (14.39 USD): BGCITYADS2019
(CouponsFromChina.com tip: paste coupon code in your cart and click Apply after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): DGC86, 502C6B, 0404digoo, e2bcea, vipupgrade8, TTxBG10, 2019SPEDM, bgssaff9, BGPDGC8, BGC86, BGC8399, BG399RA
(probably won’t work, but you can try them out)
Price history and price alert
Do you need price history chart (for all/most countries) for Digoo DG-C8 Alarm Clock? There we go.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).